Abstract
The resistivity and the Hall effect in the copper-oxide high-temperature superconductor YBaCuO (YBCO) are remarkably anisotropic. Using a thin film of YBCO grown on an off-axis cut SrTiO substrate allows one to investigate these anisotropic transport properties in a planar and well-defined sample geometry employing a homogeneous current density. In the normal state, the Hall voltage probed parallel to the copper-oxide layers is positive and strongly temperature dependent, whereas the out-of-plane Hall voltage is negative and almost temperature independent. The results confirm previous measurements on single crystals by an entirely different measurement method and demonstrate that vicinal thin films might be also useful for investigations of other layered nanomaterials.
Highlights
The electrical transport properties of the copper-oxide high-Tc superconductors (HTSCs) are strongly anisotropic because of their layered crystalline structure
With the current injected along the CuO2 layers and the magnetic field oriented perpendicular to the layers, a positive and strongly temperature dependent Hall effect is observed [1], but it is negative and temperature-independent over a wide range [2] when the magnetic field is oriented parallel to the layers and the Hall voltage is measured perpendicular to them
We explore the anisotropic transport properties of a vicinal YBa2 Cu3 O7−δ (YBCO) film and demonstrate that anisotropic resistivities and the in-plane and out-ofplane Hall effect can be measured
Summary
The electrical transport properties of the copper-oxide high-Tc superconductors (HTSCs) are strongly anisotropic because of their layered crystalline structure. With the current injected along the CuO2 layers and the magnetic field oriented perpendicular to the layers, a positive (hole-like) and strongly temperature dependent Hall effect is observed [1], but it is negative (electron-like) and temperature-independent over a wide range [2] when the magnetic field is oriented parallel to the layers and the Hall voltage is measured perpendicular to them. In both geometries, the magnetic field is oriented perpendicular to the current to maximize the Lorentz force on the charge carriers and the Hall field is probed orthogonally to both the current and magnetic field. It would be of paramount importance to test and compare the anisotropic transport properties in an entirely different geometry
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